Evaluation of equivalent friction damping ratios at bearings of welded large-scale domes subjected to earthquakes

Zhang, H; Zhu, X; Wang, Y; Yao, S

Evaluation of equivalent friction damping ratios at bearings of welded large-scale domes subjected to earthquakes

Zhang, H Zhu, X

Wang, Y Yao, S

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Publisher:: TECHNO-PRESS
Publication Type:: Journal Article
Citation:: Steel and Composite Structures, 2021, 40, (4), pp. 517-532
Issue Date:: 2021-08-25

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Field	Value	Language
dc.contributor.author	Zhang, H
dc.contributor.author	Zhu, X https://orcid.org/0000-0001-5083-9320
dc.contributor.author	Wang, Y
dc.contributor.author	Yao, S
dc.date.accessioned	2022-05-09T06:19:24Z
dc.date.available	2022-05-09T06:19:24Z
dc.date.issued	2021-08-25
dc.identifier.citation	Steel and Composite Structures, 2021, 40, (4), pp. 517-532
dc.identifier.issn	1229-9367
dc.identifier.issn	1598-6233
dc.identifier.uri	http://hdl.handle.net/10453/157164
dc.description.abstract	The major sources of damping in steel structures are within the joints and the structural material. For welded large-scale single-layer lattice domes subjected to earthquake ground motions, the stick-slip phenomenon at the bearings is an important source of the energy dissipation. However, it has not been extensively investigated. In this study, the equivalent friction damping ratio (EFDR) at the bearings of a welded large-scale single-layer lattice dome subjected to earthquake ground motions is quantified using an approximate method based on the energy balance concept. The complex friction behavior and energy dissipation between contact surfaces are investigated by employing an equivalent modeling method. The proposed method uses the stick-slip-hook components with a pair of circular isotropic friction surfaces having a variable friction coefficient to model the energy loss at the bearings, and the effect of the normal force on the friction force is also considered. The results show that the EFDR is amplitude-dependent and is related to the intensity of the ground motions; it exhibits complex characteristics that cannot be described by the conventional models for damping ratios. A parametric analysis is performed to investigate in detail the effects of important factors on the EFDR. Finally, the friction damping mechanism at bearings is discussed. This study enables researchers and engineers to have a better understanding of the essential characteristics of friction damping under earthquake ground motions.
dc.language	English
dc.publisher	TECHNO-PRESS
dc.relation.ispartof	Steel and Composite Structures
dc.relation.isbasedon	10.12989/scs.2021.40.4.517
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject	0905 Civil Engineering
dc.subject.classification	Civil Engineering
dc.title	Evaluation of equivalent friction damping ratios at bearings of welded large-scale domes subjected to earthquakes
dc.type	Journal Article
utslib.citation.volume	40
utslib.for	0905 Civil Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
utslib.copyright.status	open_access	*
utslib.copyright.embargo	2022-08-31T00:00:00+1000Z
dc.date.updated	2022-05-09T06:19:22Z
pubs.issue	4
pubs.publication-status	Published
pubs.volume	40
utslib.citation.issue	4

Abstract:

The major sources of damping in steel structures are within the joints and the structural material. For welded large-scale single-layer lattice domes subjected to earthquake ground motions, the stick-slip phenomenon at the bearings is an important source of the energy dissipation. However, it has not been extensively investigated. In this study, the equivalent friction damping ratio (EFDR) at the bearings of a welded large-scale single-layer lattice dome subjected to earthquake ground motions is quantified using an approximate method based on the energy balance concept. The complex friction behavior and energy dissipation between contact surfaces are investigated by employing an equivalent modeling method. The proposed method uses the stick-slip-hook components with a pair of circular isotropic friction surfaces having a variable friction coefficient to model the energy loss at the bearings, and the effect of the normal force on the friction force is also considered. The results show that the EFDR is amplitude-dependent and is related to the intensity of the ground motions; it exhibits complex characteristics that cannot be described by the conventional models for damping ratios. A parametric analysis is performed to investigate in detail the effects of important factors on the EFDR. Finally, the friction damping mechanism at bearings is discussed. This study enables researchers and engineers to have a better understanding of the essential characteristics of friction damping under earthquake ground motions.

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http://hdl.handle.net/10453/157164